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A savanna is…

"...a natural and stable ecosystem occuring under a tropical climate having a relatively continuous layer of xeromorphic grasses and sedges, and often with a discontinuous layer of low trees and shrubs."
Cited by Kricher, J., 1997. A Neotropical Companion: An Introduction to the Animals, Plants, and Ecosystems of the New World Tropics (2nd ed - 1999), Princeton University Press, 451 pp.